The difference between social media monitoring and private communities is that in social media research a. the primary purpose is research b. researchers cannot observe people interacting with each other unprompted by the potential bias of interviews and questions c. the data already exists and is not created by interaction with researchers d. most companies outsource community development to a provider e. because of the start-up costs involved the sample of people interacting about a product is a self-selected sample that is representative of consumer reactions in a target market